1. 다음 글에서 밑줄 친 부분이 의미하는 바로 가장 적절한 것은?

NFTs, or non-fungible tokens, are digital tokens that are purchased and sold online and represent real-world objects such as photos, videos, and artwork. NFTs function as certificates of ownership for those items, and these tokens cannot be duplicated, meaning that such a certificate is not interchangeable and there can only be one owner at a time. Although many NFTs are costly, buying them is quickly gaining popularity as doing so gives a collector a unique and special connection to the work, with their purchase being marked on a blockchain. However, as there are currently no regulations governing the making and selling of NFTs, there are copyright threats associated with them. This is due to the fact that anyone — not just the copyright holder — can publish a token for a particular item on the blockchain and put that NFT on the market, a process also known as “minting.” This means there is a possibility artists might see an NFT created for their work without their permission, which is comparable to using copyrighted material in your work without securing a license.

① it physically attaches the work to a digital chain for safer storage
② it is permanently recorded in a public digital ledger as proof of purchase
③ it transfers complete copyright to the buyer at the time of sale
④ it allows the collector to reproduce the work without legal limits
⑤ it is privately hidden from others to protect the owner’s identity